John Sirois created MESOS-229:
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Summary: mesos zookeeper group code fails to connect when
pre-existing children of the group path are read-only
Key: MESOS-229
URL: https://issues.apache.org/jira/browse/MESOS-229
Project: Mesos
Issue Type: Bug
Components: master
Affects Versions: 0.9.0
Reporter: John Sirois
We have a locked down zk tree as follows:
/ world:anyone:r
/home world:anyone:r
/home/mesos world:anyone:r,digest:mesos:XXX:cdrwa
...
This causes the mesos GroupProcess::connected code to fail as follows
attempting to establish pre-existing path /home/mesos/prod/master for the
master contender:
{code}
2012-07-08 23:25:36,322:60909(0x4d50e940):ZOO_INFO@check_events@1632: session
establishment complete on server [10.40.93.122:2181],
sessionId=0x43836278f888947, negotiated timeout=10000
2012-07-08 23:25:36,322:60909(0x4d50e940):ZOO_DEBUG@check_events@1638: Calling
a watcher for a ZOO_SESSION_EVENT and the state=ZOO_CONNECTED_STATE
2012-07-08 23:25:36,322:60909(0x4dd0f940):ZOO_DEBUG@process_completions@1765:
Calling a watcher for node [], type = -1 event=ZOO_SESSION_EVENT
I0708 23:25:36.322985 60928 detector.cpp:286] Master detector connected to
ZooKeeper ...
I0708 23:25:36.323076 60928 detector.cpp:292] Authenticating to ZooKeeper using
scheme 'digest'
2012-07-08 23:25:36,323:60909(0x49d07940):ZOO_DEBUG@send_last_auth_info@1265:
Sending auth info request to 10.40.93.122:2181
I0708 23:25:36.329813 60937 webui_utils.cpp:49] Loading webui script at
'/usr/local/share/mesos/webui/master/webui.py'
2012-07-08 23:25:39,656:60909(0x4d50e940):ZOO_DEBUG@zookeeper_process@1933:
Processing AUTH_XID
2012-07-08 23:25:39,656:60909(0x4d50e940):ZOO_INFO@auth_completion_func@1198:
Authentication scheme digest succeeded
2012-07-08 23:25:39,656:60909(0x4d50e940):ZOO_DEBUG@zookeeper_process@1983: Got
ping response in 0 ms
I0708 23:25:39.657078 60928 detector.cpp:314] Trying to create znode '/home' in
ZooKeeper
2012-07-08 23:25:39,657:60909(0x49d07940):ZOO_DEBUG@zoo_acreate@2503: Sending
request xid=0x4ffa16f1 for path [/home] to 10.40.93.122:2181
2012-07-08 23:25:39,659:60909(0x4d50e940):ZOO_DEBUG@zookeeper_process@1989:
Queueing asynchronous response
2012-07-08 23:25:39,659:60909(0x4dd0f940):ZOO_DEBUG@process_completions@1817:
Calling COMPLETION_STRING for xid=0x4ffa16f1 rc=-102
Failed to create ZooKeeper znode: not authenticated
(../../src/detector/detector.cpp:320)
{code}
The end observable behavior of GroupProcess::connected code should ideally
ensure the path exists and attempt to create nodes if they do not exist. The
current behavior is that GroupProcess::connected will refuse to use paths with
read-only root nodes even if the leaf node it needs to manage a group is
writable.
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